摘要
以芦苇为原料,采用连续一锅改性方法,制备了黄原酸化水热炭,并进行表征和吸附Zn(Ⅱ)/Cd(Ⅱ)实验。SEM、FTIR、BET等表征结果表明黄原酸基团成功引入水热炭表面。在投加量为1 g/L、pH=6的最佳条件下,黄原酸化水热炭对Zn(Ⅱ)、Cd(Ⅱ)的吸附约120 min达到平衡,最大理论吸附容量分别为73.02和93.05 mg/g。通过匹配吸附动力学和吸附等温线的数据,假二级动力学和Langmuir模型更适合描述这一现象。这表明吸附过程主要涉及化学吸附,并且只发生在单分子层上。经过5次吸脱附实验后,黄原酸化水热炭依然具有相当的吸附能力,表明黄原酸化水热炭具有循环利用价值。该吸附剂可用于含Zn(Ⅱ)或Cd(Ⅱ)的重金属废水处理。
In this study,reed was used as raw material to prepare xanthan acidified hydrochar by continuous one-pot modification,and the characterization and adsorption of Zn(Ⅱ)/Cd(Ⅱ)experiments were carried out.The results of SEM,FTIR and BET showed that xanthic acid groups were successfully introduced into the surface of hydrochar.Under the optimal conditions of 1 g/L dosage and pH=6,the adsorption of Zn(Ⅱ)and Cd(Ⅱ)by xanthan acidified hydrochar reached equilibrium about 120 min,and the maximum theoretical adsorption capacities were 73.02 and 93.05 mg/g,respectively.By matching the adsorption kinetics and adsorption isotherm data,it is found that the pseudo-second-order kinetics and Langmuir model are more suitable to describe this phenomenon.This indicates that the adsorption process mainly involves chemisorption and only occurs at the unit molecular layer.After 5 sorption and desorption experiments,xanthan acidified hydrochar still has considerable adsorption capacity,indicating that xanthan acidified hydrochar has recycling value.The adsorbent can be used for the treatment of heavy metal wastewater containing Zn(Ⅱ)or Cd(Ⅱ).
作者
李志远
马林峰
李垚
刘润泽
吴晓乐
徐景涛
LI Zhiyuan;MA Linfeng;LI Yao;LIU Runze;WU Xiaole;XU Jingtao(School of Municipal and Environmental Engineering,Shandong Jianzhu University,Jinan 250000,China)
出处
《广州化学》
2025年第4期55-60,共6页
Guangzhou Chemistry
基金
山东省重大科技创新工程项目(NO.2020CXGC011406)。
